It is USD$1 per piece. Please choose the quantity according to the amount you need to pay.
For example, if you need to make up the difference of USD$1, please pay for 1 piece, which is USD$1.
If you need to make up the difference of USD$3, please pay for 3 pieces, which is USD$3, ect.
When you place your order, please specify the item you want. If you have questions, it is best to communicate with customer service in advance via ticket, email or tidio.